Economical shipping options

A good day to everyone,

I am a student who is wanting to start an ecommerce store for designer A4 sheets. I have dabbled in this field before as well and have seen a decent demand for the product in the US and the UK and am thinking of further expanding the product shipment. However, most of the shipment agencies I have tried contacting are charging a price twice as much as even the sales price of the product. Does anyone know of any economical/affordable shipping companies? Any type would be amazing. I am actually going to use the money as funds for my further education and surprise my parents.

Note: I have used sites like shopify and feel confident enough to start my own store.

I have posted a similar post on r/startups

Thank you so much again guys